Sathasivam as the marks vs rank is a totally relative phenomenon which changes every year so no-one can actually predict your rank accurately. Still, according to last year scenario, I can predict your rank or I should say that I can tell you a range of the rank. With 27% marks under the SC category tab, you can get around 500-600 rank.

But for the final rank which can go up and down way, you will need to wait until 10th June. Although I can say surely that with 27% marks you can definitely get a seat into an IIT. Which branch and which IIT will depend on the rank which is expected to be better with your marks this time but in the end you need to wait for the final result.

Feel free to ask if you have any more queries. All the best!!